Materials with dreadful stains (6)
I believe the answer is:
satins
'materials' is the definition.
(satin is a kind of material)
'dreadful stains' is the wordplay.
'dreadful' indicates an anagram.
'stains' is an anagram of 'SATINS'.
'with' is the link.
(Other definitions for satins that I've seen before include "Stains on shiny cloths" , "Stains in expensive cloths" , "Stains on rich cloths" , "Smooth shiny cloths" , "Stains on shiny fabrics" .)